यदि $\int \frac{2x^2+3}{(x^2-1)(x^2-4)} dx = \log \left[\left(\frac{x-2}{x+2}\right)^a \cdot \left(\frac{x+1}{x-1}\right)^b\right] + c$,(जहाँ $c$ समाकलन का स्थिरांक है),तो $a+b$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{12}$
  • B
    $\frac{21}{12}$
  • C
    $\frac{-1}{12}$
  • D
    $\frac{-21}{12}$

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